netstat -anp | grep java | grep CLOSE_WAIT  -c
265

        final ClientConfig clientConfig = new ClientConfig();
        clientConfig.property(ClientProperties.CONNECT_TIMEOUT, config.getInt("http_client.connect_timeout"));
        clientConfig.property(ClientProperties.READ_TIMEOUT, config.getInt("http_client.read_timeout"));

        PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
        clientConfig.property(ApacheClientProperties.CONNECTION_MANAGER, connectionManager);
        clientConfig.property(ApacheClientProperties.CONNECTION_MANAGER_SHARED, true);

        ConnectorProvider connectorProvider = new ApacheConnectorProvider();
        clientConfig.connectorProvider(connectorProvider);

        connectionManager.setMaxTotal(config.getInt("http_client.max_total_connections"));
        connectionManager.setDefaultMaxPerRoute(config.getInt("http_client.default_max_per_route_connections"));

        client = ClientBuilder
                .newBuilder()
                .withConfig(clientConfig)
                .sslContext(SSLContextBuilder.createdTrustedAll())
                .hostnameVerifier((hostname, session) -> true)
                .build();

    public Response createRequest(String url, Client client) throws Exception {
        logger.debug("Download resource: " + url);
        WebTarget webTarget = client.target(url);
        Invocation.Builder invocationBuilder = webTarget.request();
        Response response = invocationBuilder.get();
        if (response.getStatusInfo().getStatusCode() != 200) {
            throw new Exception("Invalid response = " + url + " code = " +
                    response.getStatusInfo().getStatusCode());
        }
        return response;
    }

            try (Response response = resourceProvider.createRequest(url, httpClientProvider.get())) {
                httpExchange.sendResponseHeaders(200, response.getLength());
                InputStream is = response.readEntity(InputStream.class);
                IOUtils.copy(is, os);
            } catch (Exception e) {
                throw new Exception("Error download url " + url, e);
            }

        httpClientProvider.getConnectionManager().closeIdleConnections(1, TimeUnit.SECONDS);
        httpClientProvider.getConnectionManager().closeExpiredConnections();